Hübler, Dr. M. Dolomite Dolomite (4.8 x 6.6 cm) from the Friedrichssegen mine near Bad Ems (Rhineland-Palatinate, Germany) with its original label (4.6 x 7.8 cm) from the Dr. M. Hübler collection (Altenburg, Germany) indicating that the specimen was acquired from the Freiberg Mining Academy.